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Water-adsorption properties of Xiazijie montmorillonite intercalated with polyamine

Zhang Shifeng, Qiu Zhengsong and Huang Weian
Water-adsorption properties of Xiazijie montmorillonite intercalated with polyamine
Clay Minerals (February 2016) 50 (4): 537-548


Polyamine is a novel inhibitor applied to water-based drilling fluids in order to reduce hydration of clays, especially montmorillonite (MT). In the present study, the water-adsorption properties of montmorillonite intercalated with polyamine were characterized by X-ray diffraction (XRD), diffuse reflectance infrared Fourier transform spectroscopy (DRIFT) and adsorption isotherm tests using water, benzene and heptane. According to the XRD, DRIFT and water-adsorption test results, polyamine (PA)-intercalated montmorillonite (PA-MT) adsorbs less water than either K (super +) - or NH (sub 4) (super +) -intercalated montmorillonite (K-MT, NH (sub 4) -MT). The surface energy of MT was analysed using the van Oss-Chaudhury-Good (VCG) approach based on the water, benzene and heptane adsorption results. The surface energy between PA-MT and water was less than that of NH (sub 4) -MT and K-MT. Compared with K-MT and NH (sub 4) -MT, the surface energy of the Lewis acid portion of PA-MT underwent a more significant decrease, suggesting that the hydration of unexchanged Na (super +) did not make a discernible contribution. The experimental water-adsorption data were fitted using Langmuir, Brunauer-Emmett-Teller (BET), and Freundlich adsorption models. The Langmuir adsorption models can be used to fit the data for water adsorption on PA-MT across the entire p/p (sub 0) range. After plotting the experimental data in the linear format of the Freundlich model, only one linear region for PA-MT was observed, indicating a single water-adsorption mechanism for PA-MT. When compared with PA in the absence of clay, DRIFT spectroscopy showed that the NH (sub 2) bending mode for PA-MT shifted from 1571 cm (super -1) to 1619.7 cm (super -1) . This suggested an increase in hydrogen bonding (H bonding) between the ammonium group and the interlayer water. Across the entire p/p (sub 0) range, water is suggested to have adsorbed onto PA-MT through H-bonding interactions between the ammonium group and the interlayer water.

ISSN: 0009-8558
EISSN: 1471-8030
Serial Title: Clay Minerals
Serial Volume: 50
Serial Issue: 4
Title: Water-adsorption properties of Xiazijie montmorillonite intercalated with polyamine
Affiliation: China University of Petroleum, School of Petroleum Engineering, Qingdao, China
Pages: 537-548
Published: 201602
Other Date: 201509
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 35
Accession Number: 2016-025711
Categories: Geochemistry of rocks, soils, and sedimentsSedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
N34°00'00" - N49°00'00", E73°00'00" - E97°00'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201613
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